…the 9th century; the imam al-Hādī, a theocratic arbiter-ruler of traditional type, founded the ʿAlīd Zaydī dynasty in Ṣaʿdah of northern Yemen. About the mid-12th century a Zaydī imam extended his rule northward to Khaybar and Yanbuʿ (Yenbo) and southward to Zabīd.
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